The acceleration of a particle is defined by the relation a = = 3e−0.2t, where a and t are expressed in ft/s2 and seconds, respectively. Knowing that x = 0 and v = 0 at t = 0, determine the velocity and position of the particle when t = 0.5 s. The velocity and position of the particle when t = 0.5 s is ft/s and ft, respectively.

69. air frictionthe velocity of the satellitea. decreases b. increases c. sometimes increases sometimedecreases d. no effect at all70. the unit of gravitational potential energy isa.jouté b.watt c. newtond.pascal71. which of the following is not influenced by a magneta. cobalt b.copper c.irond. nickel72. one joule of work done in one second by unit positive chargea.1 watt b.1 volt c.1 js d. none73. the most deviated colour of light after passing through a prisea. violet b.red c. green d.yellow4. a coin is placed below a beaker fill with water upto 12 cm isdisplaced by water isa. 9cm b.6cmс.3cmd.7cm